# Iterate over two Lists in Python simultaneously

You can iterate over two lists (or more) in Python using a zip() function:

Here is an example of iterating over two lists (list_a and list_b) at the same time:

`list_a = [1, 2, 3, 4, 5]list_b = [5, 6, 7, 8, 9]list_c = []for x, y in zip(list_a, list_b):    sum_lists = x + y    list_c.append(sum_lists)print(list_c)`

The result is a third list (list_c) that contains the sum of items from the two lists:

``[6, 8, 10, 12, 14]``

Alternatively, you can achieve the same results using a list comprehension and a zip() function:

`list_a = [1, 2, 3, 4, 5]list_b = [5, 6, 7, 8, 9]list_c = [(x + y) for x, y in zip(list_a, list_b)]print(list_c)`

As you can see, you’ll get the same results:

``[6, 8, 10, 12, 14]``

## Iterate over multiple Lists in Python

You can use the same concepts to iterate over multiple lists in Python.

For instance, you can iterate over 3 lists as follows:

`list_a = [1, 2, 3, 4, 5]list_b = [5, 6, 7, 8, 9]list_c = [2, 4, 6, 8, 10]list_d = []for x, y, z in zip(list_a, list_b, list_c):    sum_lists = x + y + z    list_d.append(sum_lists)print(list_d)`

Now list_d would contain the sum of items from the 3 lists:

``[8, 12, 16, 20, 24]``

As before, you may use a list comprehension to get the same results:

`list_a = [1, 2, 3, 4, 5]list_b = [5, 6, 7, 8, 9]list_c = [2, 4, 6, 8, 10]list_d = [(x + y + z) for x, y, z in zip(list_a, list_b, list_c)]print(list_d)`

The result:

``[8, 12, 16, 20, 24]``